Display device and fabrication method thereof

Abstract

A high-resolution display device is provided. The display device includes a plurality of light-emitting units emitting light of different colors. The light-emitting unit has a microcavity structure and intensifies light with a specific wavelength. In the light-emitting units emitting light of different colors, reflective layers with different thicknesses are formed, an insulating layer is formed to cover the reflective layers, and then a top surface of the insulating layer is subjected to planarization treatment, whereby an insulating layer with different thicknesses is formed. After that, light-emitting elements emitting white light are formed over the planarized top surface of the insulating layer to overlap with the respective reflective layers, whereby the light-emitting units that intensify different colors due to different optical path lengths are separately formed.

1 . A display device comprising:
 a first light-emitting element, a second light-emitting element, a first insulating layer, a first optical adjustment layer, and a second optical adjustment layer,   wherein in each of the first light-emitting element and the second light-emitting element, a lower electrode having a light-transmitting property, a light-emitting layer, and an upper electrode having a semi-transmissive property and a semi-reflective property are stacked in this order,   wherein at least top surfaces of the first optical adjustment layer and the second optical adjustment layer each have a function of reflecting visible light,   wherein the first optical adjustment layer is thinner than the second optical adjustment layer,   wherein the first insulating layer is provided to cover the first optical adjustment layer and the second optical adjustment layer and has a planarized top surface,   wherein the first light-emitting element overlaps with the first optical adjustment layer with the first insulating layer therebetween, and   wherein the second light-emitting element overlaps with the second optical adjustment layer with the first insulating layer therebetween.